Based on the problem during the practice in geological hazard susceptibility zoning, by constructing the threemark (-1，0，1) matrix and introducing optimum transfer matrix, the faintness about weight choice and the consistency check method of judgment matrix for traditional AHP were improved，and the difficult weight quantization problem for each appraise factor of the hiberarchy model had been solved; accordingly, the Improved AHP model had been built. At the last, this method was applied to a concrete zoning practice about geological hazard susceptibility.The application result shows that the zoning practice in Yongchuan region about geological hazard susceptibility is practical and effective.